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List of Figures Figure 1-1: Watershed Division of River Islands Development....................................................................3 Figure 1-2: River Islands Phase Division form a stormwater perspective ....................................................4 Figure 1-3: River Islands Main Phase Division.............................................................................................4 Figure 1-4: River Islands Phase 1, Stage Division from a storm water perspective.....................................5 Figure 1-5: Schematic plan view of the Phase 2 pump station.....................................................................6 Figure 2-1: Example plan View of XPSWMM Model for phase 2 .................................................................7 Figure 2-2: Typical Lake Outfall Structure for 36" Equalizer Pipes...............................................................8 Figure 2-3: View of XPSWMM Input Data for Lake Storage Capacity..........................................................9 Figure 2-4: Schematic Lake Storage Capacity Graph ................................................................................10 Figure 2-5: Example of XPSWMM Input Data for Lake Depth and Initial Depth ........................................11 Figure 2-6: Lake interconnection pipe and pump station connection layout...............................................12 Figure 2-7: Approximate contributory drainage area for phase 2 lakes......................................................14 Figure 4-1: Graphical representation of the result for analysis of model configuration Alt 6-L-V20-ca-PS-D- 48. ...............................................................................................................................................................21 Figure 4-2: Graphical representation of the result form analysis of model configuration Alt6-L-ca-V20-la- PS-D-48.......................................................................................................................................................22 Figure 4-3: Result for the dynamic analysis for model configuration AIt6-L-V20-ca-PS-D-d......................23 Figure 4-4: Result for the dynamic analysis of model configuration Alt6-L-V20-la-PS-D-d........................24 List of Tables Table 2-1: Lake Storage Data for Phase 2 Lakes.......................................................................................11 Table 2-2: Pipe Lengths and Invert Elevations for Phase 2........................................................................13 Table 2-3: Scaling factor based on Approximated Contributory Drainage Area.........................................15 Table 2-4: Scaling based on Contributory Area Relative to Lake Size.......................................................16 Table 4-1: Result table for model configurations Alt-6-L-V20-ca-PS-D and Alt-6-L-V20-la-PS-D..............25 Table 4-2: Difference in water surface elevation between the two hydrograph scaling methods...............27 Table 4-3: Maximum velocities in the outlet manifold.................................................................................27 List of Appendices Appendix A: Lake Volume Exhibit Appendix B: Lake Storage, Volume and Depth Tables Appendix C: Lake Interconnection Pipe Length Exhibit Appendix D: Phase 2 Hydrograph scaling Appendix E: Phase 2 Individual lakes XPSWMM Result Graphs Appendix F: All lakes graphs for static analyses Appendix G: XPSWMM Results For Phase 1 Lakes River Islands Phase 2 Stormwater Mitigation Rev 2 2 1� PACE